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Methane combustion catalyst, and preparation method and application thereof

A methane combustion and catalyst technology, which is applied in combustion methods, catalyst protection, chemical instruments and methods, etc., can solve problems such as high temperature and easy sintering, and achieve the effects of improving high temperature resistance, improving catalytic combustion performance, and avoiding overflow.

Inactive Publication Date: 2017-03-15
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a methane combustion catalyst, improve the high temperature resistance performance of the methane combustion catalyst, and solve the problem of high temperature and easy sintering of the methane combustion catalyst in the prior art

Method used

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  • Methane combustion catalyst, and preparation method and application thereof

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preparation example Construction

[0030] The present invention provides the preparation method of the methane combustion catalyst described in the above technical scheme, comprising the following steps:

[0031] (1) Mix tricobalt tetroxide precursor, templating agent, polyvinylpyrrolidone and hydrogen peroxide in water, and perform hydrothermal reaction to obtain hydrothermal product;

[0032] (2) mixing the hydrothermal product obtained in the step (1) with a noble metal precursor and a silicon dioxide precursor, and reacting to obtain a combustion catalyst precursor;

[0033] (3) Calcining the combustion catalyst precursor obtained in the step (2) to obtain a combustion catalyst with a core-shell structure.

[0034] In the invention, the tricobalt tetroxide precursor, template agent, polyvinylpyrrolidone and hydrogen peroxide are mixed in water, and the hydrothermal reaction is carried out to obtain a hydrothermal product. In the present invention, the precursor of tricobalt tetroxide is preferably a solubl...

Embodiment 1

[0057] The core part of the core-shell catalyst of this embodiment is composed of 1.0wt% Pd, 30.0wt% CO 3 o 4 Composition, the rest of the mass is the shell part of SiO 2 .

[0058] The preparation method of this embodiment is:

[0059] (1) Mix 100ml of cobalt nitrate solution with molar concentration of 0.6mol / L and 20ml of 0.05mol / L hexamethylenetetramine aqueous solution in proportion, add 0.0006mol of polyvinylpyrrolidone and 30ml of 3wt% hydrogen peroxide aqueous solution , stirred at 40°C for 4h, and the stirring speed was 200rpm.

[0060] (2) 80ml mass fraction is the PdCl of 0.2wt%Pd 2 solution, directly add the solution described in (1), and continue to stir at 45° C. for 1 hour at a stirring speed of 400 rpm. Then, 128 ml of ethyl orthosilicate ethanol solution with a mass fraction of 50% was added dropwise to the above solution, and stirred at 50° C. for 4 h at a high rotation speed of 1200 rpm. Filter and wash, dry at 120°C for 6 hours, and high-temperature r...

Embodiment 2

[0063] The core part of the core-shell catalyst of this embodiment is made of 0.5wt% Pt, 20.0wt% CO 3 o 4 Composition, the rest is the shell part of SiO 2 .

[0064] The preparation method of this embodiment is:

[0065] (1) Mix 100ml of cobalt nitrate solution with molar concentration of 0.9mol / L and 45ml of 0.05mol / L hexamethylenetetramine aqueous solution in proportion, add 0.0003mol of polyvinylpyrrolidone and 50ml of 15% hydrogen peroxide aqueous solution , stirred at 50°C for 7h, and the stirring speed was 400rpm.

[0066] (2) 36ml mass fraction is the PtCl of 0.5%Pt 2 solution, directly add the solution described in (1), and continue to stir at 50° C. for 2 h at a stirring speed of 300 rpm. Then, 200 ml of ethyl orthosilicate ethanol solution with a mass fraction of 50% was added dropwise to the above solution, and stirred at 70° C. for 6 h at a high rotation speed of 850 rpm. Filter and wash, dry at 100°C for 6 hours, and calcinate at 800°C for 8 hours to obtain ...

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Abstract

The invention provides a methane combustion catalyst, and belongs to the field of combustion catalysis catalysts. The methane combustion catalyst has a core-shell structure, the core part includes cobaltosic oxide and a precious metal, the shell part includes silica, the precious metal is coated with the high temperature-resistant shell, the shell has tunnels which allow reaction molecules to freely enter the core and to react with the active sites of the precious metal, generated product molecules diffuse out of the shell, the dimension of the active sites is greater than the dimension of the reaction tunnels in the shell in the whole process in order to avoid overflow of an active components, a mass ratio of the core part to the shell part in the core-shell structure and the thicknesses of the core part and the shell part are accurately limited to improve the high temperature resistance and the combustion catalysis performance of the methane combustion catalyst, and the catalyst still has a good combustion catalysis performance at 900 DEG C, and solves the problem of easy sintering at a high temperature of methane combustion catalysts in the prior art.

Description

technical field [0001] The invention relates to the field of catalytic combustion catalysts, in particular to a methane combustion catalyst. Background technique [0002] Methane is not only an energy gas, but also a greenhouse gas that is harmful to the environment. Its greenhouse effect is 21 times that of carbon dioxide, and its ability to destroy the ozone layer is 7 times that of carbon dioxide. The amount of methane emitted from coal mines into the atmosphere in my country is about 10 to 15 billion cubic meters per year. The emission of these gases not only causes huge damage to the environment, but also causes a huge waste of resources. The reason for this situation is that the emission of coal mine gas is huge, and the concentration of methane is generally lower than 0.5%, so it is difficult to directly burn and recycle. [0003] Catalytic countercurrent combustion technology is the main research direction to solve this problem, and the research and development of h...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J33/00F23G7/07
CPCB01J23/8913B01J33/00F23G7/07
Inventor 吴志伟朱华青秦张峰李志凯樊卫斌王建国
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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